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DogCatRespiratory

Difficulty breathing

Effortful, noisy or open-mouth breathing, an extended neck, inability to lie down, or blue-grey gums may signal inadequate oxygen. Respiratory distress can worsen within hours or faster and become life-threatening.

Emergency

Go to a clinic immediately if

  • Gums are blue, grey or very pale, the pet collapses or is visibly struggling for each breath
  • Open-mouth breathing in a cat, unless clearly due to heat or brief extreme stress, needs emergency assessment
Contact a veterinary clinic

Possible signs

  • Rapid, noisy or effortful breathing at rest, neck extension, inability to lie down or open-mouth breathing in a cat
  • Active abdominal effort, elbows held away from the body, flared nostrils or unusually still sitting can signal respiratory distress

What it is

Breathing difficulty may result from airway narrowing, asthma, fluid in the lungs or chest, heart disease, pneumonia, trauma or severe allergy. Dogs and cats can compensate and hide respiratory compromise until they suddenly can no longer do so. It is not safe to identify the cause at home.

What to expect at the veterinarian

The clinic will assess the pet with minimal handling because stress can worsen breathing. Oxygen and a calm environment may be provided before radiographs, ultrasound, blood testing or other diagnostics. Depending on the cause, treatment may include opening the airway, removing air or fluid from the chest, or treating asthma, heart failure, pneumonia or shock.

Sources

Updated: 26 Oct 2026

Important information

This guide does not diagnose and does not replace veterinary advice.

Do not give human medicines, leftover antibiotics or other treatment unless a veterinarian directs you. If you are unsure how urgent a sign is, contact a veterinary clinic.